#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

#define A_MEGABYTE (1024 * 1024)

int main()
{
	char *some_memory = (char *)0;

	printf("A read from null %s\n", some_memory); // 空指针字符串
	sprintf(some_memory, "A writer to null \n");  // 向空指针里写数据
	exit(EXIT_SUCCESS);
}
